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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Composition of Nonaccrual Loans and Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total $ 42,754us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 38,381us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 6,676us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
7,143us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 1,026us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
1,017us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Multi-family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 2,005us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
1,834us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
SBA    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 342us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
285us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Lease financing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 663us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
100us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
Single family residential mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 21,328us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
15,419us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Consumer Home Equity Loan | Green Loans (HELOC) - first liens    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 10,678us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
12,334us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
Consumer Home Equity Loan | Green Loans (HELOC) - second liens    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
209us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
Other consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 36us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
40us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
Non-Traditional Mortgages (NTM)    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 13,635us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
14,592us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
Non-Traditional Mortgages (NTM) | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
Non-Traditional Mortgages (NTM) | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Non-Traditional Mortgages (NTM) | Multi-family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
Non-Traditional Mortgages (NTM) | SBA    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
Non-Traditional Mortgages (NTM) | Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Non-Traditional Mortgages (NTM) | Lease financing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
Non-Traditional Mortgages (NTM) | Single family residential mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 2,957us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
2,049us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 10,678us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
12,334us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
209us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
Non-Traditional Mortgages (NTM) | Other consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_NonTraditionalMortgagesLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
Traditional Loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 29,119us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
23,789us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
Traditional Loans | Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 6,676us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
7,143us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialandIndustrialReceivableMember
Traditional Loans | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 1,026us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
1,017us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Traditional Loans | Multi-family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 2,005us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
1,834us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialMultiFamilyReceivableMember
Traditional Loans | SBA    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 342us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
285us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialSmallBusinessAdministrationReceivableMember
Traditional Loans | Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Traditional Loans | Lease financing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 663us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
100us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_CommercialLeaseFinancingReceivableMember
Traditional Loans | Single family residential mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 18,371us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
13,370us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerSingleFamilyResidentialMortgageReceivableMember
Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= banc_ConsumerHomeEquityLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
Traditional Loans | Other consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual loans and leases, Total $ 36us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
$ 40us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ banc_FinancingReceivablePortfolioSegmentAxis
= banc_TraditionalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember